tests: add a test for the latest dumpio fix

* tests/dumpio.expected: New file.
* tests/unix-pair-send-recv.c: New file.
* tests/dumpio.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add unix-pair-send-recv.
(TESTS): Add dumpio.test.
(EXTRA_DIST): Add dumpio.expected.
* tests/.gitignore: Add unix-pair-send-recv.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b2b5945..901df50 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,7 +24,8 @@
 	uid \
 	uid16 \
 	uid32 \
-	uio
+	uio \
+	unix-pair-send-recv
 
 stat_CFLAGS = $(AM_CFLAGS) -D_FILE_OFFSET_BITS=64
 statfs_CFLAGS = $(AM_CFLAGS) -D_FILE_OFFSET_BITS=64
@@ -37,6 +38,7 @@
 	strace-f.test \
 	qual_syscall.test \
 	caps.test \
+	dumpio.test \
 	fanotify_mark.test \
 	getdents.test \
 	ioctl.test \
@@ -71,6 +73,7 @@
 
 EXTRA_DIST = init.sh run.sh \
 	     caps.awk \
+	     dumpio.expected \
 	     getdents.awk \
 	     mmsg.expected \
 	     net-yy-accept.awk \